scholarly journals Las esporas de Acrocladium auriculatum y Lepyrodon lagurus (Bryophyta) de la región fueguina de Argentina

2021 ◽  
Vol 9 (1) ◽  
pp. 55-62
Author(s):  
M. Raquel Piñeiro ◽  
Rosana Solan ◽  
Sonia L. Fontana
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Morphological Characteristics ◽  
Diagnostic Value ◽  
Biological Information ◽  
Herbarium Specimens ◽  
Morphological Differences ◽  
Scanning Electron

Acrocladium and Lepyrodon are pleurocarpic moss genera of Southern distribution. The species A. auriculatum and L. lagurus inhabit in the Fuegian region of Argentina as the dominant representatives of these genera. A detail description of their spores has not been reported up to now. The objective of this study is to compare the morphological characteristics of the spores and establish their diagnostic value in the systematic of these taxa. The spores were studied from herbarium specimens, with Light Microscope and Scanning Electron Microscope. The results showed differences between the size ranges and the type of spores ornamentation. These characteristics would add to and contribute to reinforce the morphological differences between species, highlighting the role of spores as an important source of systematic and biological information for these taxa.

Spore morphology of Selaginella (Selaginellaceae) from China and its systematic significance

Phytotaxa ◽  
2015 ◽  
Vol 237 (1) ◽  
pp. 1 ◽  
Author(s):  
Xin-Mao Zhou ◽  
Li-Jü Jiang ◽  
Liang Zhang ◽  
Xin-Fen Gao ◽  
Zhao-Rong He ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Morphological Characteristics ◽  
Spore Morphology ◽  
Systematic Significance ◽  
First Time ◽  
Scanning Electron

Using light microscope (LM) and scanning electron microscope (SEM), the megaspores and microspores of 77 samples representing ca. 70 species of Selaginella from China are observed. Combing previous studies, the spore morphology of nearly all documented Selaginella species from China were reviewed. Based on the morphological characteristics in megaspores and/or microspores, we divided the spores of Chinese species into 15 types and three types are further divided into various subtypes. Each type and subtype are described in detail and a key to the types and subtypes of spores is given. For the first time, the systematic significance of microspores of Selaginella are discussed, and the results indicate that microspores of Selaginella are significant in the systematics of Selaginella. Some important morphological characteristics in spores (e.g., color, micro-sculpture, size, etc.), often been neglected in previous studies, are introduced. Some spore-morphological synapomorphies of the clades and subclades, identified by recent molecular work (Zhou et al. 2015a), are well established. Using the spore morphology, the delimitation of some taxonomically difficult species in Selaginella is assessed.

Comparison of Larval Stored Product Beetle Mandibles by Light Microscope and Scanning Electron Microscope

1981 ◽  
Vol 64 (1) ◽  
pp. 199-224
Author(s):  
John E Kvenberg
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscopy ◽  
Light Microscope ◽  
Morphological Characteristics ◽  
Scanning Electron ◽  
Conventional Light Microscopy

Abstract Larval stored product beetle mandibles were studied by comparing images made by scanning electron microscopy with those made by conventional light microscopy. Discussion of morphological characteristics is based on illustrations of 25 species

Autoecious species of Puccinia on Cichorieae in North America

1981 ◽  
Vol 59 (6) ◽  
pp. 1078-1101 ◽  
Author(s):  
J. A. Parmelee ◽  
D. B. O. Savile
Keyword(s):  
Electron Microscope ◽  
North America ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Microscope Examination ◽  
Electron Microscope Examination ◽  
Morphological Differences ◽  
Scanning Electron

Seventeen autoecious species of Puccinia occurring on Cichorieae (Asteraceae) in North America were studied. The taxa removed from those usually treated synonymously with P. hieracii include: P. troximontis Pk. and P. hypochaeridis Oud., which are segregated because of their completely echinulate urediniospores. Puccinia agoseridis sp.nov. is also segregated from the same complex because of difference in teliospore wall sculpturing. Both varieties of P. harknessii stand apart from P. hieracii by their more conspicuous teliospore warting. Puccinia harknessii var. harknessii attacks Lygodesmia while P. harknessii var. stephanomeriae comb.nov. occurs on Stephanomeria. Puccinia chondrillina is separated from P. hieracii by its smaller urediniospore tonsures and P. lapsanae possesses tonsures which are absent in P. variabilis. Such morphological differences become more evident with the use of scanning electron microscope examination to support observations with the light microscope.

Marine fungi from Seychelles. I. Nimbospora effusa and Nimbospora bipolaris sp. no v. from driftwood

1985 ◽  
Vol 63 (3) ◽  
pp. 611-615 ◽  
Author(s):  
Kevin D. Hyde ◽  
E. B. Gareth Jones
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Marine Fungi ◽  
Undescribed Species ◽  
Scanning Electron

Collections of filamentous marine fungi in Seychelles included Nimbospora effusa Koch and an undescribed species, Nimbospora bipolaris Hyde & Jones sp. nov. Tha latter differs from N. effusa in the size of the ascospores and in ascospore appendage morphology. Both species are illustrated by light microscope and scanning electron microscope micrographs.

SEM OBSERVATIONS ON 'TAWARA-SHIBO' (A SERIES OF SWELLINGS ALONG THE AXIS) STEMS OF CHAMAECYPARIS OBTUSA

IAWA Journal ◽  
2002 ◽  
Vol 23 (1) ◽  
pp. 83-96 ◽  
Author(s):  
Ryogo Nakada ◽  
Kaichiro Kawamura
Keyword(s):  
Growth Rate ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Growth Rates ◽  
Light Microscope ◽  
Chamaecyparis Obtusa ◽  
Stem Form ◽  
Anatomical Features ◽  
Hormonal Secretion ◽  
Scanning Electron

The anatomy of tawara-shibo stems of Chamaecyparis obtusa (Siebold & Zucc.) Endl. was observed using a scanning electron microscope (SEM) and a light microscope. Tawara-shibo is a strange stem form with a series of swellings that appear at regular intervals along the stem axis. Multiseriate rays, trabeculae and related structures, and modified tracheids were frequently observed at swollen portions. These features were less frequent at non-swollen portions.We conclude that abnormal cambial activities, occurring at regular longitudinal intervals, cause the formation and development of these three anatomical features and higher growth rates at swollen portions. As a result of differences in growth rate between swollen and non-swollen portions, the stem form of tawara-shibo develops. It is suggested that formation of the characteristics observed in tawara-shibo stems is genetically controlled by hormonal secretion into or within the cambium.

scholarly journals Características palinológicas de las araliáceas de México

2017 ◽  
pp. 117 ◽  
Author(s):  
Victoria Sosa
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Pollen Grains ◽  
Point Of View ◽  
Generic Level ◽  
Dichotomous Key ◽  
Pollen Characters ◽  
Scanning Electron

This work studies 17 species of mexican Araliaceae from the palynological point of view belonging to the genera Aralia, Dendropanax, Didymopanax, Redera, Oreopanax y Sciadodendron . All the pollen descriptions are presented at the generic level. The grains were studied based in scanning electron microscope and light microscope. It includes a dichotomous key for the genera grains. The results showed few differences between the pollen grains of the genera although some exine characters are important. Redera and Didymopanax presented an exine semi-tectate and the rest of the genera had tectate-perforate grains. This paper compared also some pollen characters with morphological ones, finding pollen characters considered primitive correlated with characters of primitive Araliaceae groups .

scholarly journals Morphology and ecology of Thalassiosira Cleve (Bacillariophyta) species rarely recorded in Brazilian coastal waters

2009 ◽  
Vol 69 (4) ◽  
pp. 1059-1071 ◽  
Author(s):  
M. Garcia ◽  
C. Odebrecht
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Water Temperature ◽  
Wide Temperature Range ◽  
Coastal Waters ◽  
Light Microscope ◽  
Temperature Range ◽  
The World ◽  
First Time ◽  
Scanning Electron

The detailed description of rarely recorded Thalassiosira species in Brazil is presented with light microscope (LM) and scanning electron microscope (SEM) illustrations. A total of 78 phytoplankton net samples (20 µm) collected between the years 2000 and 2006 in coastal waters of southern Brazilian, Cassino Beach and the estuary of Lagoa dos Patos, were studied in cleaned material using the Axiovert Zeiss LM and Jeol 6060 SEM. Water temperature and salinity of samples and six species are presented: Thalassiosira endoseriata, T. hendeyi, T. lundiana, T. minuscula, T. oceanica and T. wongii. Two species, Thalassiosira hendeyi and T. endoseriata were the most common being observed in all seasons at Cassino Beach in a wide temperature range (10-26 ºC), while only sporadically in the estuary of Lagoa dos Patos. Thalassiosira endoseriata, T. lundiana, T. oceanica and T. wongii are for the first time reported in Brazilian coastal waters. The latter two species, rarely recorded in the world, are fully illustrated based on Brazilian material.

Taxonomic studies in the genus Haplanthodes (Acanthaceae)

Phytotaxa ◽  
2021 ◽  
Vol 516 (3) ◽  
Author(s):  
PRADIP VIKRAM DESHMUKH ◽  
SIDDHARTHAN SURVESWARAN ◽  
RAMCHANDRA DNYANOBA GORE ◽  
MANOJ MADHWANAND LEKHAK
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Pollen Grains ◽  
Prolate Spheroidal ◽  
New Variety ◽  
Exine Ornamentation ◽  
Taxonomic Studies ◽  
First Time ◽  
Scanning Electron

The endemic Indian genus Haplanthodes (Acanthaceae) is revised. Four species, viz. H. neilgherryensis, H. plumosa, H. tentaculata and H. verticillata and a new variety, H. neilgherryensis var. toranganensis are recognized. Lectotype is designated for Haplanthodes, Haplanthus plumosus and H. verticillaris. The nomenclature of the Linnaean name Ruellia tentaculata is also discussed. Micromorphology of seed using light microscope (LM) and scanning electron microscope (SEM) is observed for the first time, and two types, reticulate and micro papillate, have been recognized based on surface sculpturing pattern. The genus differs from the related genera Andrographis and Haplanthus by distinctly two grooved seeds with hygroscopic hairs. Pollen grains of the genus are oblate or prolate spheroidal, distinctly triangular, trizonocolporate with reticulate exine ornamentation.

scholarly journals Glycera sheikhmujibi n. sp. (Annelida: Polychaeta: Glyceridae): A New Species of Glyceridae from the Saltmarsh of Bangladesh

Diversity ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 213
Author(s):  
M. Hossain ◽  
Pat Hutchings
Keyword(s):  
Electron Microscope ◽  
New Species ◽  
Scanning Electron Microscope ◽  
Morphological Characteristics ◽  
Longitudinal Ridge ◽  
Type 3 ◽  
A New Species ◽  
Scanning Electron

A new species of glycerid polychaete, Glycera sheikhmujibi, is described from the saltmarsh on the central coast of Bangladesh. The species is identified based on morphological characteristics using both a light microscope and scanning electron microscope (SEM). The species is characterized by the presence of three distinct types of proboscideal papillae: type 1 papillae (conical with three transverse ridges), type 2 (conical with a straight, median, longitudinal ridge), and type 3 (round, shorter, and broader, with a straight, median, longitudinal ridge). It has a Y-shaped aileron with gently incised triangular base, almost equal-size digitiform noto- and neuropodial lobes in the mid-body, and long ventral cirri at the posterior end. The new species is compared with its related species, previously described from the Bay of Bengal region. A key to all these species is provided.

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